MAGNIFYING GLASS - PowerPoint PPT Presentation

How can a teacher increase the size of her pay check? By looking at it through a magnifying glass . MAGNIFYING GLASS. By: Toni-Ann Smith and Thomas Bailey. A magnifying glass is…. An instrument made of a convex lens that enlargers an image and focuses light.

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Bacon was born in 1214 in a small village in Somerset.He studied optics at Oxford in Paris and became a professor there. He is credited with the invention of the magnifying glass because of his inputs and curiosity with optics. His greatest contribution dealt with lens, reflection and refraction.

To draw the rays for a convex lens you first draw a ray from the top of the object to the top of the lens and then it will bend towards the focal point as it exits the lens. The second ray should be drawn from the object to the center of the lens and continue in the same direction. The third ray is drawn from the object l through the focal point and then parallel.

Where all the rays meet up is where the image will be located, at the focal point.

The image will be virtual if the distance of the object is less than the focal length.

To have a virtual image that the image is on the same side of the lens as the object and you cant touch it. It is not inverted and much larger than the object.

Depending on the distance the lens is from the object and the distance from the lens to the focal point, the image will either be real or virtual.

The image will be real, and inverted if the focal length is less than the distance of the object. It will be larger is the distance form the object to the lens is less than twice the focal length and vice versa for a smaller image

Shortly after Bacon made the magnifying glass, the first convex eyeglasses were being made in Europe. The invention of the magnifying glass and more discoveries about the convex lens lead to the invention of binoculars (useful for bird watching or upper level seats at beaver stadium), microscopes (which helped revolutionize the fields of chemistry and biology), and telescopes (which help astronomy and allows me to view spectacular images courtesy of NASA’s powerful scopes.

I'm astonished at how many different things have stemmed form the invention of the magnifying glass, and how much of our daily lives involve some sort of by-product from the study and invention of convex lens and the magnifying glass

It’s amazing how so many people (and me before this class) can tell you that a magnifying glass can enlarge an object of image, but they do not know why. Now, whenever I look through a magnifying glass I will be able to explain how and why it works.